import Vue from 'vue'
import VueRouter from 'vue-router'
import Login from '../components/Login.vue'
import ceshi from '../components/ceshi.vue'
import Home from '../components/Home.vue'
Vue.use(VueRouter)

const routes = [

    {
        path: '/',
        redirect: '/login'
            // 重定向路由
    },
    {
        path: '/login',
        name: 'Login',
        component: Login
    },
    {
        path: '/ceshi',
        name: 'ceshi',
        component: ceshi
    },
    {
        path: '/home',
        name: 'home',
        component: Home
    }


]

const router = new VueRouter({
        routes
    })
    //掛載路由導航守衛
router.beforeEach((to, from, next) => {
    // to将要访问的路径 
    // from代表从哪个路径跳转而来
    // next是一个函数，表示放行
    //next()放行    next( ' /login')强制跳转

    if (to.path === '/login') return next();
    const tokenStr = window.sessionStorage.getItem('token')
    if (!tokenStr) return next('/login')
    next()
})

export default router